I’ve used Thorium (not as my main browser) and I like it. Decent privacy features, performance does feel better.

Some major downsides though:

1. It is not frequently updated to the latest Chromium patch; there have been times where Thorium has lagged three major versions behind. And just forget about getting patches that fix major security vulnerabilities until the next major update.
2. The browser is heavily opinionated, and while that has resulted in a browser with a half-useable version of the Chrome refresh, see this issue and it’s clear the focus is not on privacy.

If you want a browser that’s more focused on privacy and don’t care about the eye-candy that Thorium provides, the Cromite browser is only doing security + privacy patches, has toggles for more permissions, has V8 disabled by default, allows for automatic clearing of history, allows you to change the default referrer policy, has more chrome://flags, and actually gets updates frequently to the latest patch.

I’m not a GNU/Linux expert, I’ve only used it on a server for a short time, but I have some things to share.

Remember: search engines are your best friend! Obviously it would be better for someone to recommend a program for your specific use case, but you can find things like notepadqq (Notepad++) or xone (Drivers for your Xbox One controllers) with just one search.

About GNU/Linux distributions: each of them provide a different set of software, including package manager, desktop environment, file system, etc. You can basically ignore the differences between distros if you use distrobox, which will let you install software regardless of your distro. Other differences will mainly be in the actual software they distribute (so you may need to use sudo apt rather than pacman or whatever.

The “flavours” of distros can mean different things, often though they just have a different desktop environment so it runs kinda different, or it is designed for a different use case.

For your use case, Pop!_OS has an ISO that includes Nvidia drivers, and Linux Mint also lets you install the proprietary drivers. Both are fairly common in the GNU/Linux space (especially with beginners) so you can get tons of support with those.